Quick connection to 2.4GHz wifi. The measurements are excellent. It helped me find a device that was consuming 20 watts in standby! Since then, I turn it off from the switch.

ATTENTION: if you have set it up as a main switch on the panel at the beginning, do not turn off the power remotely because the router will also turn off and you will not be able to turn it back on. To restore the power, you will need to go to the location with your mobile and connect via Bluetooth. I would expect it to have a hard on/off button on the meter so you don't need a mobile. Obviously, they did this for Airbnb rentals where you set a kWh consumption limit, so if the guest uses it up, they can't turn the power back on. However, it's very easy to create an account, download the app, connect via Bluetooth, and turn the power back on yourself. So the "protection" is invalid.

The indications on the app are complete. I don't know if the notification for overvoltage/undervoltage limits means that it automatically cuts the power for protection or just sends a notification.

I deduct one star for the hard button, which I consider important.

For a month now, it has been working perfectly for both kWh and voltage limits. The mobile app and Wi-Fi communication are very good. You can see everything from your mobile phone.

Positives
- Easy to connect
- Displays data correctly, same as the central meter
Negatives
- Disconnects suddenly from wifi, and after reconnecting it does not show the total consumption from the last time it disconnected instead of each day.
- You cannot export the data
- Does not connect to Home Assistant
- Expensive for what it offers

Only as a reliable brand, but otherwise if it had covered the negatives beyond the price it would be a very excellent product

The instructions included in the package are very good. You connect your phone to the local WiFi. It forces you to connect your phone to detect the location, otherwise it won't proceed!! You activate Bluetooth on your phone and the meter, and you download the app from the website or scan the QR code provided. The instructions guide you to connect the meter to the local WiFi.
Immediately on your phone, you see the meter's data!!!! Up to this point, everything went perfectly!!!
But if... you try to turn off the meter from the app, then the meter won't turn on again!!!!
Nor does it have a (reset) button to make it work again!!!! (There is a relevant video by Geyer Hellas on YouTube about how to reconnect)
(In this specific case, we have a house where we suspect electricity theft and we want to remotely turn off the power)
Edit.
To make it work again, I did the following: I removed the meter from the panel, gave direct power to the house from the DEI meter (because even if I brought the router close to the panel, there was no way to bring the fiber optic!), connected the meter with a cable to a socket with power and from there reopened the app so it could find the network and work!!!!

I still can't understand the following:
a) Why does it absolutely require me to enable device location!
b) Why doesn't the app turn on the meter via Bluetooth!

ATTENTION: The router must be connected before the power enters the Geyer!!!)

Edit 14/06/24
So, I've been using it for almost a month now and I can say it's excellent. (There was indeed electricity theft) (I raised the stars to 5)
I check it 3-4 times a day.
The app on the phone opens very quickly and I can see in real time what the house is consuming at that moment, how much it has burned each day (it keeps a history), and what the total kilowatt-hours are so far.

Edit 19/05/26
It suddenly lost its wifi and I reconnected it very easily.
A bravo to Geyer Hellas for updating the instructions on YouTube.
I discovered that the meter keeps a history of the total consumption (only by months) for the 2 years I've had it!!!